Adjustable tone-arm and sound-box coupling.



L. MARKELS.

ADJUSTABLE TONE ARMAND SOUND BOX COUPLING.

APPLICATION FILED MAY 29. I915.

' Patented Dec. 12, 1916.

WITNESSES IIVVE/l/TOR W Zeonardfl/ar/Zela.

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NEW YORK, N. 31C, ASSIGNOR T0 CHAMPION GRAPH-OPfilJNE (YUMPAIQ'Y, INC 01? NEW YORK,1N". Y. i

ADJUSTAIBLE TONE-ARM AND SOUND-BOX COUPLING.

mesons.

Specification of Letters Patent. Pgmhgntgd D QflE, 19

Application filed may 29, 1915. Serial No. 31,149.

This invention relates to tone arms and sound boxes, and more particularly to an adjustable connection whereby the sound box can be set to operate on phonograph records having the up and down or lateral sound undulations.

The invention has for its encral ob'ects n 7.!

to improve and simplify the construction of devices of this character so as to permit of an easy and quick adjustment of the soundbox, to be of durable and substantial design and comparatively inexpensive to manufacture.

A further object of the invention is the provision of a pair of stops on the tone arm arranged at ninety degrees apart so that the back of the sound box body can engage with either stop and thereby be set at the proper position for operating on either type of disk phonograph record. H

' With such obg'ects in view, and others which will appear as the description prm ceeds, the invention comprises various, novel features of construction and arrangement of parts which will be set forth with particularity in the following description and claims appended hereto.

In the accompanying drawing, which illustrates one embodiment of the invention and wherein similar characters of reference indicate corresponding parts in all the views, Figure 1 is aside view of a tone arm showing by full lines the sound box thereon set for operating in a laterally waved record groove, and by dotted lines the sound box set for operating in a vertically waved sound groove; Fig. 2 is an enlarged front view of the tone arm and sound box with portions in sections; Fig. 3 is a sectional view on the line 33, Fig. 2, showing the two positions of the sound box; Fig. 4- is a side view showing the sound box set for operating in a vertically waved sound groove; Fig. 5 is a perspeetive view of the stop device applied to the tone arm; and Fig. 6 1s a sectional view showing a different form of elbow on the sound box.

Referring tothe drawing. A designatesa tone arm of a disk record phonograph; and

B is the reproducer or sound box which hasv a needle or stylus holder 1 of any desired form. The sound box is capable of two adjustments so as tooperate-on either ofthe well-known types of disk records. Between the sound box and tone arm a special form of connection is provided that enables the sound box to be adjusted through ninety degrees about the axis of the'outer down wardly bent extremity 2 of the tone arm. The extremity of the. tone arm is externally reduced to form a shoulder 3. and the reduced portion is provided with an external thread 4'. Surrounding this reduced portion and engaging the shoulder 3 is a stop ring 5 which has diametrically extending lugs 6 which provide surfaces 7 and 8 respectively that are disposed at an angle of ninety degrees to each other, said stop ring being (lo-- tachably fastened to the tone arm by a set screw or equivalent de'vice 9. The sound box has on the rear side of its body at 10 an elbow 11 which may be integral with the body, or separate therefrom and ,securely fastened thereto, asshown in Fig. 6, Where the elbow 11 enters an opening 12 in the sound box body and is fastened by a key screw 13. The elbow is threaded to screw onthe extremity of the tone arm but the sound box can turn on the latter only through an angle of ninety degrees because of the stops 6 on the stop ring 5, as clearly shown in Fig. By means of this arrangement the sound box can be quickly andeasily set for operating on eithertype of phonograph disk record. In order to per unit the sound box to be unscrewed completely from the tone arm the fastening screw 9 of the stop ring is taken out so that connection with the accompanying drawin", the advantages of the construction and meth- 0d of operation will be-readily understood by those skilled in the art to which the invention appertains, and while I have described the principle of operation, together with the device which I now consider to be the best embodiment thereof, I desire to have it understood that the device shown is merely illustrative and that such changes may be made when desired as fall within the scope of the appended claims.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. The combination of a tone arm, a sound box, an elbow on the sound box detachably connected 'with the tone arm and rotatable thereon, and a stop ring fixed on the tone arm and arranged to engage with and limit the turning of the sound box on the latter.

2. The combination of a tone a-rm section and a sound box section, one section havinga portion into which the other section screws.

and a ring ,on one section removably secured thereto and having spaced stops for limiting the relative turning of, the sections through an angle of ninety degrees.

3. The combination of a tone arm section turned for screwing or unscrewing the sections.

4. A tone arm having a reduced extremity forming a shoulder, a ring on the said extremity and engaging the shoulder, means for detachably'fastening the ring to the tone arm for preventing turning of the ring, said ring having spaced stops, a sound box, and

-a member connecting the box with the reduced portion of the tone arm and supporting the box in a position whereby the body thereof is adjustable to engage either of the said stops.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

LEONARD MARKELS.

Witnesses:

C. BRADWAY, PHILIP D. ROLLHAUS. 

